Chain-repair tool.



J. N. MAQDONALD. cam: REPAIR- TOOL. APILIOATION iILBD JULY 20,1912.

Pa tented 0013.22, 1912.

Wrrxv sses 91. 03 mm 1/. M

UNITED sraxrns- PATEN OFFICE.

JOHN N. MACDON LD, or HARTFORD, CONNECTICUT, ASSIG-NOR TO JAMES M.

MACDONALD, OF WETI-IERSFIELD, CONNECTICUT.

cHAIN-RErAI-R TOOL.

Application filed July 20, 1912. Serial No. 7 o,e41.

Specification of Letters Patent.

PatentedOct. 22,1912.

To all whom it may concern:

Be it known that I, JOHN N. MACDONALD,

useful Improvements in Chain-Repair Tools,

of which the following is a specification.

This invent-ion relates to chain repair e "tools and particularly to animprovement in tools for opening and closing the end hooks of the crosschains of an automobile tire chain and the like.

My present invention involves certain new improvements intheconstruction of the bills of the wedging; members, and further ofthe'construction of the closing members by which the parallel hooks maybe maintained parallel preventing overlapping and distortion.

Various other features of construction are also included which will bemore fully de-' principles involved in'my invent-ion.

Throughout specification and drawing like reference numeralsare'employed to indicate corresponding parts. and in the drawmgs.

Figure 1 is a side view of a tool embody ing my invention, Fig. 2 is anedge view of the same, Fig. 3 is an end view showing the overlappingbills. Fig. I is an enlarged detail of the head showing the action ofbills in opening a hook. and Fig. 5 is a detail showing the action inclosing.

The tool as illustrated comprises a'pair of crossed handle members 1 and2 pivoted at 3.

.The member 2 has an offsetbill 5 having an external expanding surface 5and an internal expanding surface 5?. The offset portion leaves aninclined shoulder 6. The bill of the member 1 is correspondingly formedwith an offset wedge 4 with the shoulder 7 and having anexternalexpanding surface 4: and an internal expandingsurface 4 Justinside the bills on each jaw. is formed a projection lOwhich constltutesa stop and also defines an opening 8 which provides a free space inwhich the shank or point of the hook may rest during the openmgoperation shown in Fig t. the pro ect1on l0 and between it and the hill3 is formed another projection 10 defining.

two openings 9 into which'the parallel hooks L of the end hook of thechain L may rest In this position the'hooks are in closing. heldabsolutely parallel in closing with a firm pressure so that there is nopossibility of theoverlapping of the points.

The offsetting of the wedges 5 so that they lie on the opposite side ofthe pivot 3 from that on which the handle crosses makes mutual lateralsupport for the wedges. The shoulders 6 and 7 furthermore providesupports for the tips of the wedges shortly after.

they come into contacttherewit so that; as

Just below i the strain of the wedges increases they are.

supported by the shoulders 6 and 7 L 7 Various modifications mayobviously be made in'my device, all without departing from the spirit ofmy invention if-within the limits of the appended claims.

What I. therefore, claim and desire to secure by Letters Patent is 1. Atool of the class described comprising a pair f pivoted crossedmembers,a wedge shaped ill on each member, said bills being each latgrallyoffset so as to lie in the plane of the pposite member and forming withits own men'obera shoulder for receiving and supportingthe point of theopposite bill.

2. A tool of the class described comprising a pair of pivoted crossedmembers, a wedge shaped bill on each member, said bills being eachlaterally offset so as to lie in the plane of the opposite member andforming. with its own member a shoulder for receiving and supporting thepoint of the opp site bill. each of said members being corresp ndinglyrecessed below its bill to form a clearance space below the surface andeach having a pair of similar grooves providing opposite individualbearing surfaces for closing the'hooks while supporting them inparv apair of pivoted crossed members, a Wedge I grooves for supporting doublehooks in parshaped bill on each member, said bills being I allelposition during closing. 10

each offset so as to lie in the plane of the, In testimony whereof Iafiix my signature opposite member, and forming with its own in presenceof two witnesses. member a shoulder for receiving and sup- JOHN N.MACDONALD. porting the point of the opposite bill, each Witnesses:

of said members being correspondingly re- MAY G. MoC-omnox,

cessed below its bill. 3:0 form similar opposite JAMES M. MACDONALD.

